Mississippi is pretty easy: Only two carriers. I have no idea what their relative market share is (the enrollment data along with a lot of other stuff is redacted in their filings), but in this case it really doesn't matter because both of the carriers are requesting nearly identical rate changes anyway...which is to say, just about no change whatsoever.

The Urban Institute projected that #MandateRepeal and #ShortAssPlans would add a 17.2 percentage point rate hike factor in Mississippi. I generally knock 1/3 off of their estimates to err on the side of caution (11.4%), but given Ambetter specifically stating that they didn't add any increase to account for #ShortAssPlans (why?? interesting!), I'm shaving off a bit more and assuming a flat 10% impact.

This means that unsubsidized Mississippi enrollees would likely have saved a good $800 apiece next year without Trump/GOP efforts to undermine the ACA this year.